And the reason it does is because of this overlapping.

但是它增长的很快,原因就是它的重叠子问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

One was overlapping sub-problems.

一件就是重叠的子问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

I have used divide and conquer, as we seen before, to recursively break it into smaller problems. But the smaller problem of fib of 4 and the smaller problem of fib of 3 overlap with each other.

正如我们之前看到的，我已经进行了划分,并且递归性的把它分解为更小的问题,但是fib的简化问题,和fib的简化问题会相互重叠。

麻省理工公开课 - 计算机科学及编程导论课程节选